An arbitrary order Bessel beam with arbitrary incidence is generated numerically in finite-difference time-domain(FDTD) method using a total-field/scattered-field (TF/SF) approach. This is implemented by decomposition of Besselbeam into a series of plane waves, which are projected into the FDTD simulation domain. The off-axis incidence case isrealized by tuning the arrival time when the elementary plane wave gets to the center area of simulation domain, and theoblique incidence case is implemented by rotating the plane waves through Euler angles. Numerical examplesconcerning backscattering radar cross-sections (RCS) are presented to demonstrate the validity, accuracy, and capabilityof the proposed method. The results in this paper provide an efficient way to investigate the interactions of Bessel beamsand particles with complex shape and composition using FDTD.
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